Hi doctor,For a week or two now, my thighs have been really itchy. It always starts when I first get into bed and usually continues until I fall asleep. I've noticed a rash on one of my thighs. I'm pretty sure they aren't bites, and I haven't been bitten anywhere else. Any idea what could be causing this?

That could be Fungal infection, maintain personal hygiene and visit Dermatologist for evaluation and appropriate treatment.